/*
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package nayasis.study.gson;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.List;

import com.google.gson.annotations.SerializedName;

/**
 * A model object representing a cart that can be posted to an order-processing
 * server
 * 
 * @author Inderjeet Singh
 */
public class Cart {
    public final List<LineItem> lineItems;

    @SerializedName( "buyer" )
    private final String buyerName;

    private final String creditCard;

    public Cart( List<LineItem> lineItems, String buyerName, String creditCard ) {
        this.lineItems = lineItems;
        this.buyerName = buyerName;
        this.creditCard = creditCard;
    }

    public List<LineItem> getLineItems() {
        return lineItems;
    }

    public String getBuyerName() {
        return buyerName;
    }

    public String getCreditCard() {
        return creditCard;
    }

    @Override
    public String toString() {
        StringBuilder itemsText = new StringBuilder();
        boolean first = true;
        if( lineItems != null ) {
            try {
                Class<?> fieldType = Cart.class.getField( "lineItems" )
                        .getType();
                System.out.println( "LineItems CLASS: "
                        + getSimpleTypeName( fieldType ) );
            } catch( SecurityException e ) {
            } catch( NoSuchFieldException e ) {
            }
            for( LineItem item : lineItems ) {
                if( first ) {
                    first = false;
                } else {
                    itemsText.append( "; " );
                }
                itemsText.append( item );
            }
        }
        return "[BUYER: " + buyerName + "; CC: " + creditCard + "; "
                + "LINE_ITEMS: " + itemsText.toString() + "]";
    }

    @SuppressWarnings( "unchecked" )
    public static String getSimpleTypeName( Type type ) {
        if( type == null ) {
            return "null";
        }
        if( type instanceof Class ) {
            return ( (Class) type ).getSimpleName();
        } else if( type instanceof ParameterizedType ) {
            ParameterizedType pType = (ParameterizedType) type;
            StringBuilder sb = new StringBuilder(
                    getSimpleTypeName( pType.getRawType() ) );
            sb.append( '<' );
            boolean first = true;
            for( Type argumentType : pType.getActualTypeArguments() ) {
                if( first ) {
                    first = false;
                } else {
                    sb.append( ',' );
                }
                sb.append( getSimpleTypeName( argumentType ) );
            }
            sb.append( '>' );
            return sb.toString();
        } else if( type instanceof WildcardType ) {
            return "?";
        }
        return type.toString();
    }

}